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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '714f9af42978ae3173eb4390f0abfa42f0243e5c205206c48a960c76f5956994' 
  AND token = 'enZ8tkfW6xIhsfGWhVx5VJx+/trRiXySGVd8F+NLSbs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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