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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '668b612b2d9eed49faee3ba5bdb005e26fbadf7570d8d66f75e20429d016bad2' 
  AND token = 'nPzN7Mz3LYYqDuUdeIJ876Z7s6j8Qw5ymAZoZbzPYCU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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