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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b817b1e2b5d41cb1cd19af36ecaa0a989d760811ddaa75f75a5e78f536b696f4' 
  AND token = 'Revn28pzt1jYC6WuTisGGDZX2GEgZWMtQDJY+5ze964=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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