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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea35b21dfe6eb40d355997b2bcb937b2496cd2877cf34bc98d6344006fb0e75b' 
  AND token = '/zJi7b62qgSjqH4nOl8x1zSqc6g7BTIvPUaU8pYjQnA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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