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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc052a3a408513f3765a0558c73e06b4fab39b1bf3051e399bd619bb92bc43cf' 
  AND token = '4kuYHzU1TWvCz1L1AMiLtPeSrcatD41gg3e1fzJrGOs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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