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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'caec966fc26f23fa27c8cdd325631a285111a6bbfac7c6c905fa0e25f852189b' 
  AND token = 'BB/gLJ9S7owumTWtw1dCio5Sy3c78j+qAp/pvnFwnJs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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