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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd2c98f2cf96cc83f9059f86eb7e6ce57cc49fd3bdba43196752ff13d166d11f' 
  AND token = 'vvue5BWKMK+bfKXQzHgFl7rzOBeTgM5/A93+GU5dl78=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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