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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee47f2eb35af6ea0da1bb6699f8f7c6b10c53524bb45f310a7ca4e0e4b18d58e' 
  AND token = 'NOm/GL6Nd3oSIXSFCqTofhWl9GgSyo02GghAd+tJw74=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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