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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fdba18da4c9e181d592e8983e3b918f6c961d87d997ad6695d55ad1ac5f20c86' 
  AND token = 'A3Gl8wa7RdpmfEYktmyNcTE/Ne8IS4GQ8M89AQrHRXY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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