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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b387f26991abbffe49e82c53a45d8ac8d834a98d1f3ddb6e0122c0538ff7616' 
  AND token = 'LM2N6F8SodYd3x42ZQ8Desci2cpbFgzvTTWQTS4q2tM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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