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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1eafaaa938c5546f7a182cc55db74520b93f963d8851d58a9bd8066ea50271cd' 
  AND token = 'Q7k0fo2QfyxNcb2vyfT0sDvOSIaTvBpSWfBiLMh/Y8o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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