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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '773daecf9550af1456aa5ee1247131ed411efd3797e46d34d30f971662696740' 
  AND token = 'ch6Mh5ggA2k/mdglHjzMRM7JhsZKyr693tHzc2U7x6o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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