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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e8a9412610c92d8e0e4221fcc747a592f38fd6c88ce7a5761f40cdadec6f6d4' 
  AND token = 'ylsTwQFjhpcMpqJaN8IPRQE4QwWqqlJx+wTbuuq2VkE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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