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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c5d5a6e2d1da4674e9e7274a2f02e4d3d1aed36890e8be8b8bc7357e1f434f4' 
  AND token = 'eZMQRFlkEPQ2Mewo7dLiqMs04gXFUL/7/ucg8tDY+HY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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