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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f4663b9b2cf95787599361e0c38275da822b34856c74dffe2d7b18cdecb8b47' 
  AND token = 's/Wd5DiDeGep1rfGdZScoiw3BRpBRC7y1gP2OGuEH40=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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