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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20ce0bba492237703d6de97add6ba3de3147bb548b1acc4a328bf271a27288be' 
  AND token = 'CR7hUu0bBi29eYl1IWDlfA+oexrS5cDNvtC+Pt+6/XM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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