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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b2134265b24a2a627d08c5e8c30f0199e87b5d7f22a2630b3f1f8e8d1d0c86c' 
  AND token = 'rTxvfLZg+M093THAw8uYFjSp1huXz6bF60wK6tFvNcY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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