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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6d48a99c55fcef63417d5c5ba95acb4f358e90af976b0616693109e10087318' 
  AND token = '8AzZ43tkEudf3G65R5J48ix75zp0h3PwG4Z3U76GGCs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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