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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1c67152c9b25724cdf4178ba026d60b9ee7b0a0270327d2ca4726a93b4ff4b8' 
  AND token = 'TSnPctM2XJuahQYRKkYtEIB8k6Qi88N4qLouq2fzX9E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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