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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da321e6c2e81977336a34378fd99fb863f2d44b4d6442a01015a29e9e6f34223' 
  AND token = 'TBcDW7KyZUoQ8IJry6VRbJuf6QDr5avPzi+kbBywM0w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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