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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b14c4a5a89b9185fbe2d6d203ed05d18e95ff0dd3d694bb4d9fbc50ee26bc0ca' 
  AND token = 'Kjnh1twfkaxTo+DNC5jJ8N4x+MyNuRw2p4PYlaYasfY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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