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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '475e6f439633d91493d36fd40e65fabd0e83a526e7e87b39eec0e5811d57a425' 
  AND token = '0UuFaxB4LIY3x1xIhFoFm+dxy9d4YYruW6t/PYcc56s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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