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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c00c86ec27ccb4a31ec74689dd7a7f98abf86002866a7eb941f6aff819f230a9' 
  AND token = 'KRA+k63VXLODR46CMAlRJJRA27An0Xcve5aLPmi1nZk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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