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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '223c0a06d56dc791b1ab356aa1c224f680a64cc3fcf6dd3bc1ed2956a244aa81' 
  AND token = 'KrjcyrzdTpTQj7q7lOIUHl3HAASIsQS/TetSPW/1Ih4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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