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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9eac08c3c1fde681ffd9dee39d3524c623b7e9ba4f06220a81448bc5b432915c' 
  AND token = 'JYJt+MZNS64DnvzolFDSTA5Ib03de4C+C99qikTr8ss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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