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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '034633e220b7c926c3fd88afa89cdbd7747c6465df71a0d24c972af4b87289ae' 
  AND token = '0ULgK8WzdcwfzJqcZdP3UNAU7XCm3Xdb/NHxWYsAMik=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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