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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f4379a74b530d43a0fa53b897c703aee5624237337bbc6b2d72ed4575c11a95' 
  AND token = '3QtAk7NiVLvEp3xB8GrIQYLg4FqGm33RR2lFjKAWl/Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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