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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e7a9f88e07435873b97f2cb5cab25072cbdf53927e33d3c8f99252e147cab92' 
  AND token = 'vh+hGlOGqhsICMO0x5sFLydkBuuLL8PFI1ExGOd2hJo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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