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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a7d136b71624d18ac61c6d39b7f3ee021e95bb9b68f276818553102e0e05c46' 
  AND token = 'Cgwe4M1qEjr0lCtcV2BRwu5zqtBQwyzQnqyc4mJGbVs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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