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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1b37bfaa09cec2e48f76a85660fd0f631b048a64c94c2ac92c20647f3146d5b' 
  AND token = '1iGxkReYrbaK4IyJTkVGBuxK683FrVDdmA4dQEcbOSA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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