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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd0388fa0751605f245e5950e3fbf5c60c1d90ce80c3f6c42bec6cddf3055392' 
  AND token = '3Ph72h7VsQlfxObOaieRQIEQ0b6FTDghxQYYpm6Emds=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}