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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7e8de3b077a196eaf1a7e63e021e1f676beccdb9c2f94feff6a28f7a243ca50' 
  AND token = '1H6h5yixNoPKsAqHMRlgewCvpEp4eUWDU0wyxSHHakE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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