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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29f0fab11549b803f19126518d7c0c4d8d1f05d5830a9e9ef866aa9b2f83e525' 
  AND token = 'W8y62SFCuJjCRCt2oIIPZ2hFEXBzmSF3K8xo4R0DAbM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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