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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31f23124e0f5233713c56d1d8d52f591ed5ed591bd6b22a5b22a916d46328878' 
  AND token = 'ojJfpI+7fhJbVTNo5teYAqW3cHnEw4ZGuabPtscdPds=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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