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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3f29ca99cdabd50c5329b26cbfe5b0bdc1d20db88007a949f8a08c9a8b5955b' 
  AND token = 'z2truBbBvSwAqiJNLiKPwyoLScP+cXrQp3q0mcRfhyk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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