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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce812ebf2df878508ba113a7e73b0762786a8c2b0da16f148886b7bebbb4e8dc' 
  AND token = 'e7d53UeVnaf9/rP1tK0ROTHC5qx8L3t9mh4AKHldjdQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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