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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93538a8031efa8ca1781e0b1821ebad351bbef6695576cfc551db75852a9e83c' 
  AND token = '0XEQVli79UBV9AG9XIc3lAVRYVC+6fYLHmbsFVrB5fQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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