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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ea8ec487dc9c9a4c9e13058e07de6e48bd39a1875c265d6e8ba9aeeec33b461' 
  AND token = 'se6cN0ZLlSoyGKnPQloPNPPVU/apkeLJHKxYB/itzk0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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