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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f207fcd4c6dbbe98e27f0bde8c5bbe5e26d59ce36d9bd45e62eb89d590706d8' 
  AND token = 'Ho+6skj8JOyOh0M86RkvDMWJqzb+6bGfyiMrvJ4kgD0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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