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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83dc20eedfa5c889e5755d81ff92ef8ec71a34eec0f16b2a4b561aaaf9ac655a' 
  AND token = '9vPwEK4cmH1G6JxtqW2tItsCdd9gYbVtR1SGb6kbp+Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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