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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64f3dc836be711bdd38fd401627955a9c1c90565c81f6ca679f75152540bdfc0' 
  AND token = 'I139fzpLd6ve8N0s3IGPNpsFda3l3dNzZ4bRkL8qxYw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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