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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ddd01bc9d64bc40141e083659eb5247b485b9fa1e56d37a78c13233d63ea5599' 
  AND token = 'wxO8QkIPsIPb6gfxk8WMoC4Ga9hfkpDleIgOPc5oqGs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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