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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '199e8fedffb53556d5efd38c81f9b1d6e1930f5e9f179538de391c908cfd00ca' 
  AND token = '7T8wzWDDsiHPIXRWy70x9BS3NA6rY7uw3ofRc/4nLhI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00366

JSON explain

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