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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8841fbb2e1642ee358f29fb6f3517bb17201279f8a0bb07e406948c0852f6d4a' 
  AND token = 'fzAmcxQkKDBxg0BoQXMx9fh2pVM907d/g+ma0j6/l8E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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