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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f92c716b1ac031c09b69dea2cfd67fe86659e7e933944d17c889b466b118f65d' 
  AND token = '5jxwcamdT12XSnm2EKEDdip5yQgeGcHD3MvmFtP5AZk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00067

JSON explain

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