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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e883b55f2ba8310d98bbb1f7e2a6a6eede796c5207764efbfbec10fbd9b0b65' 
  AND token = '6hOQHLA4B0cUySv6EEkndr7EOcSvDIGZemG8WjHbtEc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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