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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b91be2781b76a0842c780add72ca7f54b371b684dfda6e50119b611f35a8a34' 
  AND token = 'j3H9cJesUxyPLHShuRQ71lfT7sL1DP4Y7nDWO8xEAFc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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