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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c9228bb6af2e1a59832ff8c70128f4ebaa3b0a979389aadbf1c6f2e1c959e6c' 
  AND token = 'JaM+4oR4B2P3WuyrvTKAWeoW4jZSTUPEts33kvAROPs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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