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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab9fc5f79097792c7a9b607ead00dd880cd4b7e0000ee13cd99583ee7cbac26c' 
  AND token = '1M5Lw2Gdueva7bfr/NduqS0QA95BbiS4TD5Z5+PvsV8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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