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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ae28a6ed4b16693a424aa077ead8b9db8b0fd6bb02aa4b9d1a1f1a16a26f19c' 
  AND token = 'iAQjO3vDo4hBeL1xKk+8fLdnV/wwAsz/kPnpbt6k3TM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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