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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c672e22972a46a600ed9bea3f2938faf100ed7aed4e6e2b01819c12be3c62bce' 
  AND token = 'uWewpwPtCgQ/AM2VoleHjOeFxzcc/+LOXP1yE0qkyI4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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