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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6ab830a39697f318347bd958e7c5fd1b2cca3f63e1aee73a44917f887f706dd' 
  AND token = '/l9hpm35JEA1SHg4WJyNdcHWY/dlr8Hl/HKkstr6lmg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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