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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '80bf16452426527bde9b7dcc5f3072dbdbf198be7a6be727d2d854992ce512e4' 
  AND token = 'qt30h/ChjdUdx4hGOU2oY54R5oriSDs4KhdTL1g1vok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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