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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cfc856ff0daeece814797a8ed6f3da0be3876b8c37e497424e92a1e2ed8e9145' 
  AND token = '1YOUwqDnAFcbIqAwCWrO47dQJCaKeDCmGQ5gdYnuNNQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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