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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06dda1e8d2928052e3a29425b617a0ea03ec99cea24d8f52eb6f5e694e4f87e9' 
  AND token = 'TbKGZypmaSli4AHOLpJ/1WV2vIiwdBkepzYrOMvwtQ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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