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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6bfe843e7052d4587a166022f0cd0c3d914a021b25f0cb4c561e4eb1091e19b9' 
  AND token = '719a9H5SlA6CXJcVNBi6fnSpOutFjrYce8fkuRekbfg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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