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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac6ba8d36940a9790298c7a6b3ff001bf348e9d4ff959674268d82130d40b418' 
  AND token = '+waSxJN5Z+EjseidFxn7tdfy8KDFjpYq9ap5dL9fOOk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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