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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '187359639190fdd569a3bab3751b5399a90faeeb3a1a22e9fe9d87d41e296132' 
  AND token = '3U3jYB1z3llndCgea736ju12X57JZLHwi8DQF1O0cbA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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