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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aabc1a6e9672d5401def10b740dd395b40ccfe2b6f2347fc6a591168f211fe37' 
  AND token = 'VYIL0HptqFuyHBm+uxPjN1YFRS/PiIKx19HrRs2z0aM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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