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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b50ae60ecc89c4a3f4fcb9d070b693e6506d733ecb18eca4a48d53bd0805d797' 
  AND token = 'nO7kAqpKei7CoQ2iRJIwvMsBc9E7lyQ1mXRWAaNX8ho=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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