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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '358134948d81abc9a0be69955c723a39a6e7709ad4b6b0161438b63cefc4c193' 
  AND token = 'QrtGlmVYHYPrZpwe1tGSlqhQobkkTa0eCmoE4I2g4fk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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