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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75f73e726ee5ebfe021583472c0cd9a4893d3d9702ff647149f461cd3865acbb' 
  AND token = '37L5u4XyVdKwC/g6ljUmBM97U8DbdKrK7Heg9mWv4PQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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