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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7bd04eaf5ee99f41e2c7bd37d0992c998a2854ac368e4e86dc9ca3bf5de90500' 
  AND token = 'DzvynR5zNYVLcvXqZ4f5oiMhr0LoC8igbghUGws3FVI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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