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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1881d2e0dd7eba33b00b0e58a5fa5b380a0bb4642e487f9a609cfc43d8061b91' 
  AND token = 'mHA6ygb6At6WvMiOQDEcLj6nuygE7hPVef/2u7SQ8vU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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