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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7971271b79bd94468d17c896318c34db1e4b118cd6e73e45b1d3a487d8efd39' 
  AND token = 'lYm8D79uKnn4spcZDvE74+RlJ7He/jG0TwfJ+2sX08k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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