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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e2a2c095d39762876a8f8ef264d9beed17e568df76cbd40ea4696310c1e0310' 
  AND token = 'LJ8ny/c1NrwuLOEGQML8tZA57KPekKWt1XPpPHOsBk4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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